So the sound had been fine for the majority of the game. I'm on my second Homicide case now (forgot the name, the one after the Lipstick one) and the sound of the characters speaking has completely broke. I'll gradually hear it from the left, then hear nothing at all then hear mumbling as if someone is speaking from far away. I have my subtitles on but I like to hear what they are saying obviously.

Has anyone come across this issue and is it fixable? I'm thinking it might go back to normal after I finish this case somehow (I'm hoping anyway...) but it's still pissing me off.